/*
 * Copyright (c) 2002-2013, Mairie de Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */
package fr.paris.lutece.portal.service.sessionlistener;

import fr.paris.lutece.portal.service.util.AppLogService;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpSessionListener;


/**
 * Listener service : provides registered listener access.
 *
 */
public final class HttpSessionListenerService
{
    private static final List<HttpSessionListener> LIST_LISTENERS = new ArrayList<HttpSessionListener>(  );

    /**
     * Private constructor
     */
    private HttpSessionListenerService(  )
    {
        // nothing
    }

    /**
     * Registers a listener.
     *
     * @param entry the entry
     */
    public static void registerListener( HttpSessionListenerEntry entry )
    {
        String strListenerClass = entry.getListenerClass(  );

        try
        {
            HttpSessionListener listener = (HttpSessionListener) Class.forName( strListenerClass ).newInstance(  );
            LIST_LISTENERS.add( listener );
            AppLogService.info( "New Listener registered : " + strListenerClass );
        }
        catch ( InstantiationException e )
        {
            AppLogService.error( "Error registering the listener " + strListenerClass + " : " + e.getMessage(  ), e );
        }
        catch ( IllegalAccessException e )
        {
            AppLogService.error( "Error registering the listener " + strListenerClass + " : " + e.getMessage(  ), e );
        }
        catch ( ClassNotFoundException e )
        {
            AppLogService.error( "Error registering the listener " + strListenerClass + " : " + e.getMessage(  ), e );
        }
    }

    /**
     * Get all registered listeners
     * @return all registered listeners
     */
    public static List<HttpSessionListener> getListeners(  )
    {
        return LIST_LISTENERS;
    }
}
